Drag the bar to reveal more of each sample,
drag Right to reveal more of the Topaz AI GigaPixel sample and Left to reveal more of the Photoshop CC sample.

Initially the 600% upsized images from both Adobe Photoshop CC and Topaz AI GigaPixel look almost the same
but upon closer inspection of the bird head it does appear that Topaz AI GigaPixel did manage to produce a sharper looking image.

Availability and cost.

Final Thoughts

AI Gigapixel is two sides of an axe,
It has a good side and a very bad side.

On the good side it can massively expand an image file to product large prints, if for instance you had to crop a lot in to a scene to produce a good composition.
On the bad side is it now makes it very difficult to post anything on-line to social media that cannot be stolen and used to produce usable large prints.
We tested in on a random FaceBook image that when downloaded (stolen) produced a tiny 3*3 print about 900*900px in size.
With AI-gigapixel we re-generated it at 600% up-size and produced a 36*32 print out of it, that looked surprisingly exceptionally good.
That got me worried as an image maker and is why I have not tried to push that particular product till now.

Revelations:

I do not own Topaz AI Gigapixel, I used a beta/trial version for my tests.
I am a Topaz affiliate and use affiliate links.